Akuto Sai, an orphan raised at a church, enrolls at Constant Magic Academy hoping to earn a place in the clergy, until the school's divination returns an unthinkable verdict: 'Future Occupation, Devil King.' Branded an outcast overnight, he draws the hostility of class representative Junko Hattori, the pursuit of the mysterious Keena Soga, and the constant surveillance of Korone, an android sent to watch his every move.